In plugin page of HT Mega guided:
“Elementor editor fails to load
Ans. It is due to your server PHP setting. You can increase PHP memory limit from wp-config.php file or php.ini file”
“You can increase php memory limit by modifying wp-config.php file in WordPress.
/** Memory Limit */
define(‘WP_MEMORY_LIMIT’, ‘512M’);
Paste the above code in wp-config.php file just before the line that says ‘That’s all, stop editing! Happy blogging.” “